KR101801246B1

KR101801246B1 - Method of manufacturing filament consisting of nanofiber

Info

Publication number: KR101801246B1
Application number: KR1020150146613A
Authority: KR
Inventors: 김학용; 김태우; 채수형; 박미라
Original assignee: 주식회사 우리나노; 전북대학교산학협력단
Priority date: 2015-10-21
Filing date: 2015-10-21
Publication date: 2017-11-27
Also published as: KR20170046840A

Abstract

The present invention relates to a method for manufacturing a nanofibrous array, comprising the steps of: (i) electrospinning nanofibers (f1) on a roller (R) for nanofiber arraying at high speed rotating along a clockwise direction, (ii) arranging the nanofiber arraying rollers (f) on the opposite side of the tip (T) for electric discharge using the nanofiber arrangement roller (R) The filaments F are prepared by focusing and drawing the nanofibers f2 arranged on the nanofiber arraying rollers R by using the spin coater C and then the filaments F ) Is wound around the bobbin (B) to produce a filament composed of nanofibers.
The present invention can continuously produce nanofiber filaments regardless of the amount of charge accumulated in the electrospinning process, and can efficiently arrange the nanofibers constituting the nanofiber filaments in the length direction (axial direction) of the filament, .

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method for manufacturing filaments comprising nanofibers,

More particularly, the present invention relates to a method for producing a nanofiber filament (hereinafter referred to as " nanofiber filament ") comprising nanofibers composed of nanofiber filaments arranged in the longitudinal direction The present invention relates to a method for continuously producing the same.

More particularly, the present invention relates to a method for manufacturing a nanofiber filament, wherein the nanofibers integrated in the collector are well arranged in the fiber axis direction (longitudinal direction) of the filament to be produced, the nanofibers are well separated from the collector, To a method of manufacturing a nanofiber filament that can be remarkably reduced and eventually improve the filament manufacturing processability.

As a conventional technique for manufacturing a filament composed of nanofibers, Korean Patent Registration No. 10-0595491 discloses a method of collecting electrospun nanofibers only on the regions of the collectors that are spaced apart from each other at a predetermined interval by electric charges, Discloses a method for producing nanofiber filaments by drawing narrow ribbon-shaped nanofibers integrated in a winding roller into a winding roller.

As another conventional technique, there is proposed a method of manufacturing nanofiber filaments by spinning nanofibers into a collector provided with a conductive silicon plate spaced apart at regular intervals to integrate the nanofibers between the conductive plates and then pulling out the integrated nanofibers (Nano Letters, 2003, Vol 3 (8), 1167-1171).

As another conventional technique, there is known a method of manufacturing a nanofiber filament by electrospinning and integrating nanofibers on a rotating collector having a narrow disk shape, and then pulling out the integrated nanofibers.

However, when manufacturing nanofiber filaments by the above-mentioned conventional techniques, unstable whipping motion occurs, and it is difficult to arrange the nanofibers well in the direction of the fiber axis of the filament, and a strong It is very difficult to separate the nanofibers from the collector due to the amount of charge. In the case of separating the nanofibers from the collector with strong pulling force by using a winding roller or the like for smooth separation (separation), the filaments The fibers are not uniformly arranged in the direction of the fiber axis of the fiber, so that the fiber is severely cut off and the productivity is significantly lowered.

Another conventional technique for solving such a problem is to electro-spin nanofibers on a collector of a roller rotating at high speed to arrange the electrospun nanofibers in the direction of rotation of the collector, A method of fabricating nanofiber filaments by pulling the integrated nanofibers along the direction of rotation of the collector (in the direction in which the nanofibers are arranged) has also been attempted. However, a strong charge amount between the collector and the nanofiber, Which makes it difficult to effectively separate (separate) the nanofibers from the collector.

Disclosure of the Invention Problems to be Solved by the Invention The present invention provides a nanofiber filament comprising nanofibers arranged in the direction of the fiber axis of the nanofiber filament and a nanofiber integrated into the collector, And can be easily separated (separated) in a filament form without cutting, thereby providing a method for greatly improving the manufacturing processability of the nanofiber filament.

In order to achieve the above object, according to the present invention, as shown in FIG. 1, the present invention provides a method for fabricating a nanofiber array, comprising: (i) electrospinning nanofibers f1 on a nanofiber arraying roller R rotating at high speed along a clockwise direction The nanofibers f1 electrospun are arranged along the rotation direction for the nanofiber arrangement roller R and then the nanofibers f1 are arranged on the opposite side of the tip T The nanofibers f2 arranged on the nanofiber arraying roller R are focused and drawn by using a collector C for collecting nanofibers that are installed on the nanofibers and rotate along a clockwise direction and have a trunk shape, ), And (iii) a filament (F) produced by using a ring spinner is wound around a bobbin (B) to produce a nanofiber filament.

Specifically, the produced filament F is fed to a trolley Tr of a ring spunter rotating along a ring reciprocating upward and downward through a guide G to impart twist to the filament F, B).

The present invention can continuously produce nanofiber filaments regardless of the amount of charge accumulated in the electrospinning process, and can efficiently arrange the nanofibers constituting the nanofiber filaments in the length direction (axial direction) of the filament, .

1 is a schematic view of the process of the present invention.
FIG. 2 is a schematic view showing a state in which the nanofibers f1 radiated on the nanofiber arraying roller R are arranged in the rotating direction of the nanofiber arrangement roller R and the state in which the nanofibers f1 are arranged on the nanofiber arrangement roller R Fig. 3 is a partial process schematic diagram showing a state in which ordered nanofibers f2 are focused in filament F by a nanofiber collecting collector C. Fig.
FIG. 3 is an electron microscope photograph of a nanofiber filament (F) prior to imparting a twist to a ring-shaped electrode after passing through a collector (C) for concentrating nanofibers in Example 1 of the present invention.
4 is an electron micrograph showing an enlarged photograph of a portion of FIG. 3;
Fig. 5 is an electron micrograph of a nanofiber filament (F) in a twisted state in a ring sputtering apparatus in Example 1 of the present invention.
6 is an electron micrograph of the nanofiber filament (F) prepared in Comparative Example 1 of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, a high voltage is applied to the spinning liquid through the tip (T) of an electric arc with which a high voltage is applied, and the spinning liquid is rotated at a high speed in a clockwise direction at a rotation speed of 600 m / Arranging the nanofibers (f1) radiated on the nanofiber array roller (R) along the rotation direction of the nanofiber array roller (R) by electrospinning in the direction of a roller (R) for arranging the nanofibers; (Ii) a collector (C) for collecting nanofibers, which is provided on the opposite side of the tip (T) for electric discharge using the nanofiber arrangement roller (R) Collecting and drawing nanofibers (f2) arranged on the arranging roller (R) to produce a filament (F); And (iii) winding the filament (F) produced using the ring spun yarn on the bobbin (B).

1 and 2, a high voltage is applied to the spinning solution through the tip T of the electric room with a high voltage applied thereto, and the spinning solution is rotated at a high speed of 600 m / And the nanofibers f1 radiated on the nanofiber array roller R are arranged along the rotation direction of the nanofiber arrangement roller R. The nanofibers f1 are arranged in the direction of rotation of the nanofiber array roller R. [

The angle α between the longitudinal axis of the nanofiber arraying roller R and the nanofibers f2 arranged on the nanofiber arraying roller R is 10 to 170 °, preferably 30 to 150 °, Is preferable for improving the manufacturing processability of the filament.

At this time, as shown in FIG. 1, the tip T of the electric room is positioned above the rollers R for laying the nanofibers, and the spinning solution is electrospinning downwardly of the tip T, Or the electric room use tip T may be positioned below the nanofiber arraying roller R so that the spinning liquid may be electrospinned in the upward direction of the electric discharge tip T, Or the electric room use tip (T) is positioned in parallel with the nanofiber arrangement roller (R) so that the spinning liquid can be electrospun in the horizontal direction of the electric room use tip (T) .

Since the nanofiber arraying roller R rotates at a rotation speed of 600 m / min or more, preferably at a rotation speed of 600 to 1,200 m / min, the nanofibers (f1 Are arranged well along the direction of rotation of the nanofiber arrangement roller R.

Next, as shown in Fig. 1 and Fig. 2, the nanofibers are arranged on the opposite side of the tip (T) for electric discharge using the nanofiber arrangement roller (R) The filament F is produced by focusing and drawing the nanofibers f2 arranged on the nanofiber arraying roller R by using the collector C for focusing.

Next, the filament (F) produced by using the ring spun yarn is wound around the bobbin (B) to produce a nanofiber filament.

At this time, the nanofiber filaments F, through which the nanofibers f2 are converged and drawn while passing through the collector C for collecting the nanofibers, are fed to the troller Tr of the ring spunter through the guide G, The nanofiber filament F is wound around the bobbin B while being twisted.

Since the bundler rotates along a ring of a ring spinning unit that reciprocates vertically, twisting is imparted to the nanofiber filament F wound around the bobbin after passing through the troller Tr.

Hereinafter, the present invention will be described in more detail with reference to examples and comparative examples.

However, the scope of protection of the present invention is not limited to the following examples.

Example 1

A polyacrylonitrile polymer was dissolved in a dimethylformamide solvent to prepare a 12 wt% solution. Separately, a polyurethane was dissolved in a dimethylformamide solvent to prepare a 5 wt% solution. The solution thus prepared was mixed at a polyacrylonitrile / polyurethane solution ratio of 95/5 to prepare a spinning solution. Use a cylinder pump to supply the solution at 1.2 cc / min.

A bottom-up electrospinning device having a roller (R) rotating at a high speed and a tip (T) for an electric discharge is installed in the lower part of the spinning liquid prepared as described above. The nanofiber array roller (R) was electrospun on a nanofiber arraying roller (R) having a voltage of 25 kV and a high rotation speed at a rotation speed of 905 m / min through a tip (T) And the nanofibers f1 radiated in the nanofibers are arranged along the rotation direction of the nanofiber arrangement roller R. The spacing distance between the tip (T) for the electrical discharge and the roller (R) for the nanofiber array was 20 cm, and the tip for the electrical discharge was a tubular drum with eight nozzles arranged in a cylindrical tube. The tubular nozzle was rotated at 400 rpm.

At this time, the angle? Formed by the rotation direction of the nanofiber arrangement roller R and the nanofibers f2 arranged on the nanofiber arrangement roller R was 90 °.

Next, the nanofibers f1 arranged in the rotation direction of the roller R for nanofiber arraying are focused on the nanofibers f2 with a nanofiber focusing roller C, which is a cylindrical rod having a diameter of 8 mm, rotated at 100 rpm And pulled to obtain a nanofiber filament (F).

Next, the produced nanofiber filament (F) was supplied to a ring sputtering machine and the nanofiber filament was wound on the bobbin (B) while being twisted. At this time, the speed of the ring sputtering machine was 5 m / min. FIG. 3 is a photograph of a nanofiber filament (F) electron microscope immediately before imparting a twist to a ring spinner, FIG. 5 is a photograph of a magnifying electron micrograph of FIG. 4, and FIG. 5 is a photograph of a nanofiber filament after twisting through a ring spinner (F). &Lt; / RTI > The nanofiber filaments thus prepared were well aligned with the nanofibers in the fiber length direction.

Comparative Example 1

Filaments composed of nanofibers were prepared in the same manner as in Example 1, except that the rotation speed of the nanofiber arraying roller (R) was changed to 452 m / min.

An electron micrograph of the produced filament was shown in Fig. 6 shows that the nanofibers are not well arranged in the fiber axis direction of the filament.

T: Tip for electric room P: Pump for supplying fluid
V: High voltage generator R: Nano fiber arrangement roller
C: Collector for nanofiber focusing
f1: nanofiber emitted from the tip
f2: nanofibers arranged by a collector (R) for arrangement of nanofibers
F: filament composed of nanofiber
?: Angle formed by the rotation direction of the nanofiber arrangement roller (R) and the nanofibers (f2) arranged in the nanofiber arrangement roller (R).
G: Guide
B: Bobbin
Tr: Traveller

Claims

(I) Electrospinning is carried out in the direction of the roller (R) for nanofiber array which is rotated at a high speed in a clockwise direction at a rotation speed of 600 m / min or more and a high voltage is applied to the spinning solution through a tip Arranging the nanofibers (f1) radiated on the nanofiber array roller (R) along the rotation direction of the nanofiber array roller (R);
(Ii) a collector (C) for collecting nanofibers, which is provided on the opposite side of the tip (T) for electric discharge using the nanofiber arrangement roller (R) Collecting and drawing nanofibers (f2) arranged on the arranging roller (R) to produce a filament (F); And
(Iii) winding the filament (F) produced by using the ring spun yarn on the bobbin (B).

The method according to claim 1, characterized in that the angle (α) between the longitudinal axis of the nanofiber array roller (R) and the nanofibers (f2) arranged on the nanofiber array roller (R) Wherein the filament is formed of a nanofiber.

The nanofiber according to claim 1, characterized in that the tip (T) for the electric room is located below the roller (R) for arranging the nanofibers, and the spinning solution is electrospun in the upward direction of the tip By weight.

The nanofiber according to claim 1, wherein the tip (T) for the electric room is located above the roller (R) for arranging the nanofibers, and the spinning solution is electrospun in the lower direction of the tip By weight.

The nanofiber arraying apparatus according to claim 1, characterized in that the tip (T) for electric discharge is located horizontally with the roller (R) for arranging the nanofibers so that the spinning solution is electrospun in the horizontal direction of the tip A method for manufacturing a filament composed of fibers.